A radiator whose temperature is `T^(@)C` is used to heat the room in the cold weater The radiator is able maintain a room temmperature of `30^(@)C` when ouside temperature is `10^(@)C` and `15^(@)C` when outside temperature is `30^(@)C` Determine the temperature of the radiator [Assume Newton's law of cooling to be valid] .

The temperature of a room heated by heater is 20^@C when outside temperature is -20^@C and it is 10^@C when the outside temperature is -40^@C . The temperature of the heater is

The temperature of a room heated by heater is 20^@C when outside temperature is -20^@C and it is 10^@C when the outside temperature is -40^@C . The temperature of the heater is

The temperature of a body in a a room is 80^@ C After five minutes the temperature of the body becomes 64^@ C and 10 minutes the temperature becomes 52^@ C . What is the temperature of surrounding ? ( Newton's law of cooling )

A metal sphere cools at the rate of 1.6^@C/min when its temperature is 70^@C . At what rate will it cool when it's temperature is 40^@C . The temperature of the surrounding is 30^@C .

A metal block is placed in a room which is at 10^(@)C for long time. Now it is heated by an electric heater of power 500W till its temperature becomes 50^(@)C Its initial rate of rise of temperature is 2.5^(@)C//sec The heater is switched off and now a heater of 100W is required to maintain the temperature of the block at 50^(@)C The heat radiated per second when the block was 30^(@)C is given as alpha watt. Find the value of ((alpha)/(10)) (Assume Newton's law of cooling to be valid .

A body radiates heat at the rate of 5 cal/ m^(2)-s when its temperature is 227^(@)C . The heat radiated by the body when its temperature is 727^(@)C is